<template>
    <div class="app-container">
        <!-- 顶部 header 区域 -->
        <mt-header fixed title="Vue-Yanshi">
            <span slot="left" @click="goBack" v-show="flag">
                <mt-button icon="back">返回</mt-button>
            </span>
        </mt-header>


        <!-- 中间的路由 router-view 区域 -->
        <transition>
            <router-view></router-view>
        </transition>


        <!-- 底部的 tabbar 区域 -->
        <nav class="mui-bar mui-bar-tab">
			<router-link class="mui-tab-item-llb" to="/home">
				<span class="mui-icon mui-icon-home"></span>
				<span class="mui-tab-label">首页</span>
			</router-link>
			<router-link class="mui-tab-item-llb" to="/member">
				<span class="mui-icon mui-icon-contact"></span>
				<span class="mui-tab-label">会员</span>
			</router-link>
			<router-link class="mui-tab-item-llb" to="/shopcar">
				<span class="mui-icon mui-icon-extra mui-icon-extra-cart">
                    <!-- 设置id="badge"方便获取元素的坐标 -->
                    <!-- <span class="mui-badge" id="badge">0</span> -->

                    <!-- 使用getters中的数据来自动刷新购物车中的商品数量 -->
                    <span class="mui-badge" id="badge"> {{$store.getters.getAllCount}} </span>
                </span>
				<span class="mui-tab-label">购物车</span>
			</router-link>
			<router-link class="mui-tab-item-llb" to="/search">
				<span class="mui-icon mui-icon-search"></span>
				<span class="mui-tab-label">搜索</span>
			</router-link>
		</nav>
    </div>
</template>


<script>
export default {
    data(){
        return{
            flag: false,
        }
    },
    created(){
        if(this.$route.path === '/home'){
            this.flag = false;
        }else{
            this.flag = true;
        }
    },
    methods:{
        goBack:function () {
           this.$router.go(-1); 
        }
    },
    watch:{
        // 不要写成了$route(r).path 没有r！！！
       '$route.path':function (newVal) {
           if(newVal === '/home'){
               this.flag = false;
           }else{
               this.flag = true;
           }
       } 
    }
}
</script>


<style lang="scss" scoped>
.mint-header{
    z-index: 999;
}
.app-container{
    padding-top: 40px;
    // 左右切换tab栏时，防止出现横向滚动条
    overflow-x: hidden;
    padding-bottom: 50px;
}

// 添加动画效果的类
.v-enter {
    opacity: 0;
    transform:translatex(100%);
    // position: absolute;
}
.v-leave-to {
    opacity: 0;
    transform: translateX(-100%);
    // 解决切换路由页面时，页面上飘的问题
    position: absolute;
}
.v-enter-active,
.v-leave-active {
    transition: all 0.5s ease;
}


// 该类名解决tabbar点击无法切换的问题
.mui-bar-tab .mui-tab-item-llb.mui-active{
    color: #007aff;
}
.mui-bar-tab .mui-tab-item-llb {
    display: table-cell;
    overflow: hidden;
    width: 1%;
    height: 50px;
    text-align: center;
    vertical-align: middle;
    white-space: nowrap;
    text-overflow: ellipsis;
    color: #929292;
}
.mui-bar-tab .mui-tab-item-llb .mui-icon {
    top: 3px;
    width: 24px;
    height: 24px;
    padding-top: 0;
    padding-bottom: 0;
}
.mui-bar-tab .mui-tab-item-llb .mui-icon~.mui-tab-label {
    font-size: 11px;
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
}

</style>

